/Engine/Source/Runtime/AIModule/Classes/BehaviorTree/Services/BTService_DefaultFocus.h
EBlackboardNotificationResult OnBlackboardKeyValueChange ( const [UBlackboardComponent](API\Runtime\AIModule\BehaviorTree\UBlackboardComponent) & Blackboard, [FBlackboard::FKey](API\Runtime\AIModule\BehaviorTree\Blackboard\FKey) ChangedKeyID )